Keep in mind that any tweaks made to the rig by POs will alter the 'standard' measurements and you'll have to provide your own.
Using FX or other online sources does put more pressure on 'getting it right' the first time.
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"